package com.example.springcloud.lb;

import ch.qos.logback.core.net.SyslogOutputStream;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.stereotype.Component;

import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;

/**
 * @author sunliang
 * @version 1.0
 * @date 2020/4/24 9:13
 */
@Component
public class MyLB implements LoadBalancer
{
    private AtomicInteger atomicInteger = new AtomicInteger(0);

    public final int getAndIncrement()
    {
        int current;
        int next;

        do
        {
            current = this.atomicInteger.get();
            next = current >= 2147483647 ? 0 : current + 1;

        }while(!this.atomicInteger.compareAndSet(current,next));
        System.out.println("***********第几次访问，次数next: "+next);

        return next;
    }

    @Override
    public ServiceInstance instance(List<ServiceInstance> serviceInstances)
    {
        int index = getAndIncrement() % serviceInstances.size();

        return serviceInstances.get(index);
    }
}
